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Rotary lock for needle sheaths

  • US 5,279,584 A
  • Filed: 04/30/1993
  • Issued: 01/18/1994
  • Est. Priority Date: 12/09/1991
  • Status: Expired due to Term
First Claim
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1. A syringe comprising:

  • a) a hollow syringe body having a longitudinal axis;

    b) a hollow needle communicating with the hollow syringe body;

    c) a sheath reciprocal along said axis to cover and uncover the needle;

    d) a latch reciprocal on an exterior of said sheath to latch the sheath in an extended position over the needle or to unlatch the sheath for retracting the sheath to expose the needle;

    e) a lug on one of said sheath and latch and projecting toward the other of said sheath and latch;

    f) a longitudinal slot on the other of said sheath and latch and in which the lug reciprocates for reciprocation of the latch; and

    g) a recess communicating with the slot and having a transverse wall;

    whereby rotating the latch with respect to the sheath disposes the lug in the recess and reciprocation of the latch is prevented by the lug abutting the transverse wall.

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